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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b844b666b1f14dfceef90115251dd4151cc3a8d98d00102f053f77601eb16efe' 
  AND token = 't5Jco7zBe0oZgqRfc4s4KP3okP85VIBowm8pP09ZCSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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