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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c9d2cf10f0f5357ca64c561d4b4eac02d0d2b30ad464348e321c7d0b14ca95' 
  AND token = '8IlUYhRUYPEMPPxf79JKFGE8wZHMagzt3AeusNacSRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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