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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd170eefc18ec21fe1ae3aab85d07e6bc24390d9e098756769aeb7a484c87f0' 
  AND token = 'lo1TE1sauhyVgX4yeX3NPgvj0Om8G4E+EX2xtlugE8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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