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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6206f5574001715476e31204e6a0480c459b3b2b6200d4c99a51520dedb0b1b' 
  AND token = 'iEi9htMDnPTr3uVdB0KgjUtO/REHntV1Ebwlf7Qei58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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