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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283daeaf9db38119fb1c126f28e847f2b0d6d5a1a1d76e68b6154eb3e9084c2d' 
  AND token = 'WdhN8Ssdd1uUv040sv2SL7+nBOKTAdARo10Qarn66hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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