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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f21cfdd6f5d149def361956e7f9bc427e1335f2132443b5d01e3f297b3ebb6' 
  AND token = 'zN549J3HOySmjhXJbR/3BzaoRAzLNKjJGijTitsk1fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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