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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c0f56a598c8fe0b37a8e78eeb804545e0e195b80e0924cd22f90d5886e7f77' 
  AND token = 'bOD/6zzVqDVXDqy63awFzYAyiTMLzgW42okqLZrF//s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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