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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f394418711951177be88738ae4409aaaf684be7284a4c449aebb3d28796174a1' 
  AND token = 'oC3IMQFXAl4JQGrdEd8T+laqz61l5xZkQ6tdzdX14Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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