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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '045fed474ab8b7675f9d472e29d3014fec3b6d3aec90dd7f4eac109b56277463' 
  AND token = '9ywLoQzFLAeLPPsg0wtWQN8nJyMh1MRtP03VPe6bHrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}