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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20488a24d2bdd3c7e06ee894eae4df7009b172e507476675c28fdd6d0f90f585' 
  AND token = 'O5QZ0u2+rP01aAxn+XVQkj77xniaikmytB+cCovjqF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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