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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913c104ba26c37f21b585e13a0b8f716a7f89019abb9e8504a8f064e29fe2f1f' 
  AND token = 'bQjObqG+AY+JyVm1P2dm16I1TKwkp3n2qb4t8X2T6f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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