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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea9b8438ef1af99d986a82dcdb78b57103c0bfbc1f4ae902fd1a7644d38f1e6' 
  AND token = 'eBtCRYPMdAEcgtNd5Eij1bp45t1td/nQyR3G4kWsyIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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