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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bed56f4ff3f4831e51bfa7dc760c32b2eec912146baf68a6d0b203e11b1fa3e' 
  AND token = 'plpvUy6PjzCaBCmj6/9E2ncCK1bnNnOhAwDilQ6PmXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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