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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdce20fa072f88059b3c6cc3ee58ac03e3878e18f0eb44a23cfb4a35e4b0d50a' 
  AND token = 'GSKhsdRtLzrCHWwRj+BsGuS6PCyW7Ju7GbOBW3/VFQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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